Submitted on: 17 May 2002.
Revised on: 09 June 2002.
Accepted on: 05 July 2002.
NULL
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Submitted on: 08 November 2001.
Revised on: 22 December 2001.
Accepted on: 27 December 2001.
NULL
Submitted on: 06 April 2012.
Revised on: 20 May 2012.
Accepted on: 12 June 2012.
Voprosy Obrazovaniya-Educational Studies Moscow
Submitted on: 08 January 2013.
Revised on: 14 February 2013.
Accepted on: 07 March 2013.
Voprosy Obrazovaniya-Educational Studies Moscow
Submitted on: 22 September 2009.
Revised on: 08 October 2009.
Accepted on: 20 October 2009.
NULL
Submitted on: 26 November 2000.
Revised on: 06 January 2001.
Accepted on: 25 January 2001.
Voprosy Obrazovaniya-Educational Studies Moscow